What Is Thermal Imaging

What is thermal imaging? Well, put simply, it's the process of using a thermal camera to take snapshots of an environment, allowing you to see where there may be problems such as gas leaks, circuitry outputting too much heat or even lets you see the heat escaping from buildings when conducting home insulation surveys.

Thermal cameras see things differently than human eyes. Instead of seeing visible light, the thermal camera can see radiation that takes place in the infrared part of the light spectrum (which we can't see usually). As they carry out this infra-red technique, thermal cameras are often commonly also known as infra-red cameras, infra-red thermal cameras or even IR cameras.

Most objects give off some form of thermal radiation, but when things are outputting too much heat, or losing too much heat, a thermal image lets the human user see exactly where the heat is lost. By using a thermal camera, the thermal radiation of an area is shown as visible colours, allowing the user to clearly identify hot/cold spots and (on the more expensive models) make annotations on the camera as the survey is being carried out.

If an object is above 0 degrees centigrade it gives off some kind of thermal radiation (which is also known as emissivity). Since practically every object works at different temperatures (e.g a human might output much more heat than something like a desk) picking out the different temperatures and seeing where things might be amiss is generally an exceptionally easy process. If an electrical circuit isn't working correctly, using a thermal image would then allow the user to see which component is outputting too much heat, pinpointing the source of the problem.

Most modern thermal imaging cameras are now shaped like camcorders, allowing the surveyor to easily use the camera to analyse the heat signature of practically anything. For example, using the camera to survey a radiator would allow the user to clearly see whether heat is being lost (blue image) or if the radiator is outputting heat normally (firey-orange image). Thanks to the portability of the camcorder-shaped devices, carrying out surveys like this on almost anything you can think of is extremely easy to perform.

The cameras are used in a huge amount of different areas, including building safety inspections, healthcare, veterinary practices, process control, gas leak detection and can even be found in CCTV installations. Their extensive abilities make them the perfect accompaniment to any professional's range of equipment as they really do make analysis of the environment much easier to carry out.

These images - or thermographs - can then be analysed by a surveyor instantly. Alternatively it's also possible to take thermal images and view them on a PC at a later date, allowing you to make further annotations and complete reports for clients.

Thermal imaging cameras for use in CCTV are extremely effective because of their ability to essentially see through darkness and many objects. They're often used by the police in helicopters to help them spot hiding criminals, as the heat signature emitted by a human allows the pilot to easily pinpoint a criminal's location and relay information to the ground team.

One of the most common myths about thermal imaging is that thermal cameras will allow you to see through walls. This isn't technically true - what a thermal camera will do is allow you to see heat signatures behind a wall, so if you've got installed air conditioning/ventilations, it can pick out hot/cold spots that would go unnoticed usually.

So there you have it. Thermal imaging, in a nutshell, is the process of using a thermal camera to survey an environment and pick out potential problems before they cause damage and decreased productivity in a wide variety of sectors.

SLR may be a shortened phrase for single lens reflex camera. These cameras are named this because of the fact that they have a mirror that's positioned at the rear of the camera's lens. This mirror directs light towards the viewfinder any time you build a photo.

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